A Novel Internal Fault Analysis of a Brushless DC Motor Using Winding Function Theory

This paper presents a winding function-based method to analyze the inter-turn fault in stator windings of a brushless DC (BLDC) motor. It is essential to analyze the behavior of the machine under internal faults and design appropriate protection systems to avoid expensive failures. The winding functions and inductance of stator windings are explained in detail and the informative simulation results based on the winding function theory is provided to analyze currents abnormalities and torque pulsation under turn-to-turn short. Analytical consideration of the stator currents and torque waveform of both healthy and faulty machine is also developed. The detailed simulation results of this paper are the guideline for early detection of internal failures in BLDC motors